88 Chapter 4: Measurements and Calculations
Meas. & Calcs
OB Doppler
Calculations
MCA
(Middle Cerebral
Artery)
UmbA
(Umbilical Artery)
Note: The system does not provide an MCA/UmbA ratio from the PI
(Pulsatility Index).
1 Select OB exam type, and enter either the LMP or Estab.DD into the
patient information form.
2 On a frozen Doppler spectral trace, press the Calcs key.
3 Highlight the desired measurement from the calculation menu and
press the Select key.
4 Perform the measurement.
Caliper Function
If S/D, RI is selected, the caliper function is activated.
• Position the first caliper at the peak systolic waveform. Press the
Select key and position the second caliper at end diastole on the
waveform.
OR
Manual Trace
If S/D, RI, PI is selected, the manual trace function is activated.
• Position the caliper at the beginning of the desired waveform
and press the Select key. Use the touchpad to move the caliper
to the next desired point on the wave form.
• Continue marking points by pressing the Select key. The last
point must be placed at the end of the waveform.
• Select Set from the on-screen menu to complete the trace and
display the results.
Note: If calipers are not placed in the correct position, the calculation will
not be performed accurately.
5 Select Save from the on-screen menu, or press the Enter key to save
the measurements to the patient report. The results are displayed at
the bottom of the calculation menu and a check mark is put in front of
the measurement. If desired, press the Save key to save the image
with the measurements displayed.
Note: This will save the new measurement to the patient report and
overwrite the previously saved measurement.
Note: Only one calculation (S/D, RI or S/D, RI, PI) can be saved.
6 Repeat these steps until all measurements have been performed.
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